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SU Carb
Last Post: JamesS
Posted On: 01-23-2021
Replies: 1
Views: 36
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Quick Hop
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11-09-2020, 01:39 PM
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Club Chopper Member
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Join Date: Aug 2004
Location: Woburn,
MA
Bike Year, Make, Engine: Custom Shovelhead Barhopper, BBC Venom
Posts: 686
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Not Ranked
Smoking Battery !!!
Hey Guys
My 2005 Big Bear is smoking batteries.
The powertrain is based on a 1999 Harley Evo with a 32 amp charging system.
I was out and about for a short ride the other day, when I started to smell something weird; kind of a sweet smell, by the time a got back there was smoke jetting out of both sides of my 1 year Deka AGM battery and the case was too hot to touch.
The vendor replaced the battery, but the same thing happened yesterday.
I haven't begun to troubleshoot, but i'm thinking the regulator is over charging the battery.
Any ideas on how to find the root cause.
Thank you
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11-10-2020, 04:27 PM
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Know Nothing
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Join Date: Mar 2007
Location: Alta Loma,
Ca
Bike Year, Make, Engine: 2007 custom bobber/ hybrid engine
Posts: 3,839
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Not Ranked
Quote:
Originally Posted by BostonShovel
Hey Guys
My 2005 Big Bear is smoking batteries.
The powertrain is based on a 1999 Harley Evo with a 32 amp charging system.
I was out and about for a short ride the other day, when I started to smell something weird; kind of a sweet smell, by the time a got back there was smoke jetting out of both sides of my 1 year Deka AGM battery and the case was too hot to touch.
The vendor replaced the battery, but the same thing happened yesterday.
I haven't begun to troubleshoot, but i'm thinking the regulator is over charging the battery.
Any ideas on how to find the root cause.
Thank you
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Have you put a meter on the battery while it's running to see what the voltage is ?
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11-10-2020, 04:57 PM
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Club Chopper Member
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Join Date: Aug 2004
Location: Woburn,
MA
Bike Year, Make, Engine: Custom Shovelhead Barhopper, BBC Venom
Posts: 686
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Not Ranked
Voltage
Put my voltmeter on the battery terminals.
At idle it is 14 Volts
As I rev it it climbs to to 16+ v
I'm guessing my regulator is not regulating, time for a new one
Thank you for the input
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11-11-2020, 03:15 AM
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Club Chopper Member
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Join Date: Jul 2012
Location: London,
UK
Bike Year, Make, Engine: 2008 FXSTB & 2007 127ci Ultima Godfather
Posts: 58
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Not Ranked
Make sure the regulator has a good earth.
Try running the earth direct to the battery.
I've seen this on Honda CBR900's many times in the past (It's a common fault on the Mk1 CBR's).
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